/**/
*{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.big{
    background-size: cover;
    background-image: url('./R-C.png');
    width :100%;
    height: 100vh;
    background-attachment: fixed;
    background-repeat: no-repeat;
}
.mc-lo{
    height: 139px;
    position: sticky;
    top: 0px;
}
.mcview{
    border-radius: 3px;
    width: 100%;
    height: 139px;
    background: url('./mcview.jpg');
}
.fa-logo{
    height: 512px;
    width: 512px;
     margin: 0 auto ;
}
.logo{
   
    height: 512px;
    width: 512px;
    background-image: url('./logo.png');
    float: left;
    bottom: 100px;
    left: 600px;
    z-index: -1;
}

.black-nav{
    height: 60px;
    width: 100%;
    background-color: #333;
    line-height: 60px;
}
.content{
    clear: both;
    position: sticky;
    top: 220px;
}
.content ,h1{
    text-shadow: 3px 3px #b0b0b0 ;
    font-family: initial;
    font-style: inherit;
    text-align: center;
    background-color: #fff;
}
.cover{
    z-index: -1;
    position: absolute;
    height: 70px;
    width: 100%;
    background-color: #ffffff;
    bottom: -6px;
}

.line-level{
    display: inline-block;
    height: 1px;
    width: 100%;
    border-top: 1px rgb(183, 184, 185);
    position: sticky;
    top: 270px;
    background-color: rgb(132, 126, 126);
}



wrap{
    width: 1226px;
    margin: 0 auto;
}

.nav-left{
    float: left;
}

.black-nav li{
    float: left;
    list-style: none;
}

.black-nav a{
    color:#b0b0b0;
    font-size: 16px;
    margin: 0 25px ;
    text-decoration: none;
}
.nav-left a:hover{
    color:#fff;
    font-size: 16px;
    margin: 0 25px ;
    text-decoration: none;
}
.nav-right a:hover{
    color:#fff;
    font-size: 20px;
    margin: 0 25px ;
    text-decoration: none;
}
.nav-right a:active{
    color:#b0b0b0;
    font-size: 20px;
    margin: 0 25px ;
    text-decoration: none;
}

.black-nav span{
    color:#b0b0b0;
    font-size: 16px;
    margin: 0 3.6px;
}



.nav-right{
    float:right;
}
.nav-right a{
    font-size: 20px;
}



.contain{
    height: 1600px;
    width: 90%;
    background-color: rgba(255, 255, 255, 0.747);
    margin-top: 200px;
    margin: 200px 100px 0 100px; 
}
